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Principle analysis of RFID anti-metal interference absorbing materials

Author:admin   AddTime:2021-07-07

After more than ten years of development in my country’s RFID industry, the technology is now relatively mature, especially in the past two years. Under the background that the country actively encourages and vigorously promotes the healthy development of the industry, as various factors continue to advance the Internet of Things, it has been Maintain a steadily rising development trend.

The industry has also reached a consensus on the formulation of RFID frequency standards. At present, the most common frequency in the world is 13.56MHz. Due to the stable performance and reasonable price, the 13.56MHz high-frequency RFID technology has a reading distance range that matches the actual application distance range, so it is widely used in public transportation cards and mobile phone payments. Application, especially in South Korea, Japan and other places.



RFID electronic tags are often used in metal environments. When the RFID electronic tags are close to metal, because the metal has strong reflectivity to electromagnetic waves, it will be accompanied by weakening of the signal, and the reading distance will become closer, and serious interference will occur. There is a phenomenon of card reading failure. The current general solution is to stick a layer of magnetic absorbing material on the back of the electronic label.

Absorbing materials are widely used in various aspects such as noise reduction, wave absorption and EMC of electronic equipment. Experts have also made many models to explain their working principles, forming a lot of theoretical knowledge, but the disadvantage is that these theories It is more complicated, and it is difficult for some readers who are not in the field to understand.

Combining with the many problems encountered by many engineers in the use, this article will take the 13.56MHz passive RFID system using absorbing materials as an example, using simple, simple and popular language to explain it, hoping to bring some help to the readers.

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